Arm-support



R. J. DAVIS.

ARM SUPPORT.

(No Model.)

Pateted Sept. 8, 1891.

mummmmmm :as cv., Puma-uma.. msnm UNITED STATES PATENT OEEICE.

ROBERT J. DAVIS, OF CHICAGO, ILLINOIS.

ARM-SUPPORT.

SPECIFICATION forming part of Letters Patent No. 459,134, datedSeptember 8, 1891. Application led March 30, 1891. Serial No. 386,948.(No modehl To all whom it 17m/,y concern:

Be it known that I, ROBERT J. DAVIS, a citizen of the United States,residing at Chicago, in the county of Cool; and State of Illinois, haveinvented a new and usefulImprovement in Arm-Supports, of which thefollowing is a specification.

My invention relates to improvement in supports for the use ofbook-keepers and others, while writing in account-books and other booksot' large size to steady the hand and relieve the shoulder from theweight of the raised forearm while writing at the lower ends of pages.Hy object is to provide an armsupport of the above class and of animproved construction which will render it particularly convenient anddesirable for its purpose.

In the drawings, Figure l is a perspective view of my improved device,illustrating the way of applying it to a book; and Figs. 2 and 3, brokenand enlarged perspective views of parts of the device, showing theirpreferred construction.

A is a supportingbar provided at one end with a rod B, which extendsfrom an edge of the supportingbar at a right angle thereto. At theopposite end of the su pporting-bar and extending parallel with the rodB is a supporting-blade t. A plate s, Iianged to a right angle along oneedge, is pivoted at about the center of its flange to the edge of thesupporting-bar A, adjacent to the rod B. The plate is provided in itsfree edge with a recess s. At the end of the bar A where it is providedwith the blade t are secured bearing-plates fr, which project beyond theedge of the bar A opposite the blade t. Pivotally secured to the platesr,between the latter, is a swinging supporting bar C, provided centrallywith a longitudinal guide-slot q. D is a sliding block formed of twosimilar parts p and p on opposite sides of the bar C and held in fixedrelation by a central pin o, which passes through the parts p p andloosely through the guideslot q. At opposite ends of the sliding block Dare pins n, which may pass through both parts p and p and should extend,as shown, beyond the opposite faces of the block.

To place the device in operative position upon an open book, the rod Bis inserted into the opening between the bound edges of the leaves andback of the book, and the plate s may be caused to rest upon the facesof the open pages', or it may be inserted at its ends between leaves,the recess s receiving the edges of the leaves. The bar A may be swungupon the pivot thus afforded by the rod B to extend along the loweredges of the pages at the right or left ltand side ofthe book, wherebyeither the part p or p of the sliding` block may be uppermost, and theblade t is inserted between leaves of the bool; to steady the bar A inits adjusted position.

In operation the writer rests his forearm upon the block D between thepins n, and owing to the pivotal connection of the bar C with the bar Aand the facility with which the block D slides upon the bar C the writermay move his hand, while writing, in any direction without obstruction.IIe is thus able while resting his arm to move his hand freely acrossthe bottom of the page and without hinderance to his writi ng. The bar Cmay be swung around to extend with the block D beyond the side edge ofthe book, whereby the device will be out of the way while not in use andneed not therefore be removed when the writer is writing toward the topof a page.

IVhat I claim as new, and desire to secure by Letters Patent, is

l. In an ar1n-rest, the combination of a sup port provided with meansfor attaching it to a book, and an arm-support pivotally secured theretoto swing laterally and accompany the movement of the arm in writingacross apage, substantially as described.

2. In an arin-rest, the combination of a support provided with means forattaching it to a book, an arm-support pivotally secured thereto toswing laterally and accompany the movement of the arm in writing acrossa page, and a sliding block upon the said pivotal support, substantiallyas described.

In an arm-rest, the combination of a support, att-aching means for thesupport, comprising a rod at one end ot' the support to enter betweenthe back 'of the book and the bound edges of the leaves thereof and aprojeetion toward the opposite end of the supaliy connected at one endto the bar A, and a port to rest upon leaves of the book, and

sliding block upon the bzw C, substantially as a pivotal arm-support,substantially as dedescribed. scribed.

4. In an arm-rest, the combination of a supporting-bzw A, abearing-10GB, and a supporting projection z. on the bar A, :i bei C,pivot- ROBERT J. DAVIS.

In presence 0f- J. W. DYRENFORTH, M. J. FROST.

